CN115513668A - Frequency selective surface based on continuous fiber 3D printing, design and manufacturing method - Google Patents
Frequency selective surface based on continuous fiber 3D printing, design and manufacturing method Download PDFInfo
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- CN115513668A CN115513668A CN202211350503.2A CN202211350503A CN115513668A CN 115513668 A CN115513668 A CN 115513668A CN 202211350503 A CN202211350503 A CN 202211350503A CN 115513668 A CN115513668 A CN 115513668A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
- H01Q15/002—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective said selective devices being reconfigurable or tunable, e.g. using switches or diodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
- H01Q15/0046—Theoretical analysis and design methods of such selective devices
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Abstract
A frequency selective surface based on continuous fiber 3D printing, a design and a manufacturing method thereof, wherein unit structures of the frequency selective surface are a quadrichiral unit structure and a hexachiral unit structure respectively; the quadric-chiral unit structure is formed by rotationally and symmetrically distributing four C-shaped arc rods with equal sizes, and a quadric-chiral metamaterial array is formed in an array form of end-to-end connection; the hexachiral unit structure is formed by rotationally and symmetrically distributing six C-shaped arc rods with equal sizes, and a hexachiral metamaterial array is formed in an array form by end-to-end connection; the four-chiral metamaterial array or the six-chiral metamaterial array is used for constructing a frequency selective surface; the design method can adjust the structural parameters according to the application frequency band, and the frequency adjustability and the bandwidth adjustability of the high-reflectivity frequency band are realized; the manufacturing method adopts 3D printing and can rapidly finish manufacturing.
Description
Technical Field
The invention belongs to the technical field of frequency selective surface additive manufacturing, and particularly relates to a frequency selective surface based on continuous fiber 3D printing, a design method and a manufacturing method.
Background
The frequency selective surface is a periodic array structure composed of a large number of passive resonance units, is composed of periodically arranged conductive material patch units or periodically arranged aperture units on a conductive material, usually metal is used as the conductive material, and can show total reflection or full transmission characteristics near the resonance frequency of the units. The frequency selective surface is widely applied to the fields of radar, microwave communication, remote sensing and remote measuring and the like, can be used for a radar antenna housing, reduces the radar scattering cross section, can also be used for the reflecting surface of an antenna, improves the utilization rate of the antenna, reduces the weight of a system, and is also used as a polarizer, a wave-absorbing material and the like.
Common manufacturing processes of the frequency selective surface comprise mask exposure, a flexible film transfer technology, a piece hot press molding method, a mechanical milling method and the like, the processing methods have the defects of complicated processing flow, long period, low degree of freedom, difficulty in forming a complex structure and the like, and the appearance of the 3D printing technology brings a new idea for manufacturing the frequency selective surface. Chinese patent application No. CN202210242778.8, namely a jet mask of a conductive structure, a preparation method and application, adopts a 3D printing method to print by utilizing a support material to obtain a required conductive pattern, then carries out ion sputtering, and dissolves the sputtered support material to obtain a required structure; in the chinese patent "a method for manufacturing a curved frequency selective surface array of annular units", application No. CN201711364840.6, a curved frequency selective surface structure is 3D printed with a non-metallic material, and then the surface is metalized to obtain a curved frequency selective surface shell. The existing method is to plate a metal conductive material on a 3D printing mold, the method can improve the complexity of a forming structure, but the post-processing technology does not simplify the manufacturing process, and a purer 3D printing method needs to be invented for quickly manufacturing an available frequency selection super surface in a special environment.
The continuous fiber composite material 3D printing technology is a composite material formed by mixing continuous fiber filaments and a matrix material and extrusion molding, is a newly emerging 3D printing technology in recent years, can have excellent mechanical properties, thermal properties, electromagnetic properties and the like according to different material components, has multiple functions, has the flexible and rapid manufacturing characteristics of the common 3D printing technology, and has wide application prospects in the fields of aerospace, transportation, military equipment, biological manufacturing and the like. At present, the continuous fiber composite material 3D printing technology is applied to vibration reduction, negative Poisson ratio, thermal deformation, electromagnetic shielding, sensing and the like, and is not applied to the manufacturing of a frequency selective surface.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a frequency selection surface based on continuous fiber 3D printing, a design and a manufacturing method, so that the frequency adjustability and the bandwidth adjustability of a high-reflectivity frequency band are realized, the frequency selection performance of a structure is exerted to the maximum extent, and the manufacturing can be completed quickly.
In order to achieve the purpose, the invention adopts the technical scheme that:
a frequency selective surface based on continuous fiber 3D printing, the unit structures of which are a quadrichiral unit structure 1 and a hexachiral unit structure 2 respectively; the four-chiral unit structure 1 is formed by rotationally and symmetrically distributing four C-shaped arc rods 3 with equal size, and a four-chiral metamaterial array 4 is formed in an end-to-end connected array form; the hexachiral unit structure 2 is formed by rotationally and symmetrically distributing six C-shaped arc rods 3 with equal sizes, and a hexachiral metamaterial array 5 is formed in an end-to-end connected array form; a quadrichiral metamaterial array 4 or a hexachiral metamaterial array 5 is used to construct the frequency selective surface.
A method of designing a frequency selective surface based on continuous fiber 3D printing, comprising:
1) When the frequency selection surface needs to reflect high-frequency electromagnetic waves, the arc length of a C-shaped arc of the chiral metamaterial array structure needs to be reduced, so that the wave crest of the electromagnetic reflectivity moves to high frequency; when the frequency selection surface needs to reflect low-frequency electromagnetic waves, the arc length of a C-shaped circular arc of the chiral metamaterial array structure needs to be increased, so that the wave crest of the electromagnetic reflectivity moves to low frequency;
the method for increasing the arc length of the C-shaped arc is to increase the radius r of the C-shaped arc or increase the radian a of the C-shaped arc; the method for reducing the arc length of the C-shaped arc is opposite;
2) When the frequency selection surface needs to reflect broadband electromagnetic waves, the surface density of the chiral metamaterial array structure, namely the proportion of the area occupied by the metamaterial in a unit square area, needs to be increased, so that the bandwidth of an electromagnetic reflectivity-frequency curve at a specified reflectivity is widened; when the frequency selection surface needs to reflect narrow-frequency electromagnetic waves, the surface density of the chiral metamaterial array structure needs to be reduced, so that the bandwidth of an electromagnetic reflectivity-frequency curve at the specified reflectivity is narrowed;
the method for increasing the surface density of the chiral metamaterial array structure is to increase the radian a of a C-shaped arc and simultaneously reduce the radius r of the C-shaped arc, and a four-chiral unit structure 1 is changed into a six-chiral unit structure 2; the method for reducing the area density of the chiral metamaterial array structure is opposite.
The width t of the C-shaped arc is determined by the printing material and the caliber of a nozzle of the 3D printer and is 0.2-1.5 mm;
the radian a of the C-shaped arc is limited to the maximum angle by the geometrical relationship and is 0.6 pi-1.2 pi;
the radius r and the width t of the C-shaped circular arc have a proportional relation and reflect the contour density of the structure, and the ratio of r/t is not more than 10.
A method of manufacturing a frequency selective surface based on continuous fiber 3D printing, comprising the steps of:
1) For the four-chiral metamaterial array 4, starting to print from the edge of the structure, sequentially printing continuous circular arc lines in a first direction in a reciprocating manner; after all the continuous arc lines distributed in the first direction are finished, sequentially printing the continuous arc lines in the second direction in a reciprocating mode from the adjacent edges;
for the hexa-chiral metamaterial array 5, after all the continuous arc lines distributed in the second direction are finished, the continuous arc lines in the third direction are sequentially printed in a reciprocating mode from the adjacent edges;
the first direction is two directions of a connecting line of starting points and ending points of the continuous circular arc line selected for the first time, the second direction is two directions of a connecting line of starting points and ending points of the continuous circular arc line selected for the second time, and the third direction is two directions of a connecting line of starting points and ending points of the continuous circular arc line selected for the third time; the four-chiral metamaterial array 4 only has a first direction and a second direction, the included angle between the first direction and the second direction is 90 degrees, the six-chiral metamaterial array 5 has the first direction, the second direction and a third direction, and the included angles of the first direction, the second direction and the third direction are 60 degrees;
2) And finishing the printing of the first layer in the steps, and repeating the steps when the second layer and the later layers are at the positions corresponding to the layer heights.
In the manufacturing process of the manufacturing method, an auxiliary cooling measure is applied to quickly cool and shape the molten and extruded material so as to avoid the tensile force of the fiber from deforming the structure.
The speed of printing the first layer is 100-400 mm/min, and the speed of printing other layers is 0.5-0.8 times of that of printing the first layer.
The 3D printer used in the manufacturing method is generally a continuous fiber composite material 3D printer having a function of cutting the fiber, and if a printer having no cutting function is used, the printed parts need to be post-processed to remove the part printed by the skip of the nozzle.
The material used in the manufacturing method is a composite material of continuous fibers and resin, the continuous fibers comprise metal wires, carbon fiber wires and other materials with good electric conductivity, and the resin comprises PLA, ABS, PA, PC, PPS, PEI, PEEK and the like.
The beneficial effects of the invention are as follows:
by adopting the electromagnetic frequency selection surface based on continuous fiber 3D printing, the design and manufacturing method, the structural parameters of the frequency selection surface can be adjusted according to the application frequency band, and the frequency adjustability and the bandwidth adjustability of the high-reflectivity frequency band are realized; the 3D printing method of the frequency selective surface accords with the characteristics of a chiral metamaterial structure, can manufacture a structure with better fiber orientation, gives full play to the frequency selective performance of the structure to the maximum extent, and can finish manufacturing at a higher speed.
Drawings
FIG. 1 is a schematic diagram of the structure of a chiral unit.
FIG. 2 is a schematic diagram of the structure of the "C" shaped arc rod and its parameters.
FIG. 3 is a schematic diagram of an array of chiral metamaterials.
Fig. 4 is a schematic diagram of a moving trajectory of a nozzle of the 3D printing frequency selection surface.
FIG. 5 is a diagram of the S11 parameter curve reflecting the effect of changing the radius of the arc on the reflection performance of the quadric-chiral frequency selective surface.
FIG. 6 is a diagram of S11 parameter curves reflecting the influence of changing arc radian on the reflectivity of a quadrichiral frequency selective surface.
FIG. 7 is a graph showing S11 parameters reflecting the effect of varying areal density of a quadrichiral frequency selective surface on reflection performance.
FIG. 8 is a graphical representation of the S11 parameter reflecting the effect of varying structure type of the frequency selective surface on the reflection performance.
Fig. 9 is a graph showing the S11 parameter curve reflecting the effect of different structures of a same areal density quadric-chiral frequency selective surface on reflection performance.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
Referring to fig. 1, 2 and 3, a frequency selective surface based on continuous fiber 3D printing, which combines technical features of continuous fiber 3D printing, determines unit structures of the frequency selective surface to be a quadrichiral unit structure 1 and a hexachiral unit structure 2, respectively, according to a process matching principle; the four-chiral unit structure 1 is formed by rotationally and symmetrically distributing four C-shaped arc rods 3 with equal size, and a four-chiral metamaterial array 4 is formed in an end-to-end connected array form; the hexachiral unit structure 2 is formed by rotationally and symmetrically distributing six C-shaped arc rods 3 with equal sizes, a hexachiral metamaterial array 5 is formed in an array form of end-to-end connection, and any one chiral metamaterial array can be used for constructing a frequency selection surface.
According to finite element electromagnetic wave transmission analysis, an S parameter curve of a structure of a four-chiral metamaterial array 4 or a six-chiral metamaterial array 5 shows an obvious resonance peak, the structure of the chiral metamaterial array has near total reflection performance on electromagnetic waves in a frequency band where the resonance peak appears, and the frequency selection performance is correspondingly changed along with the change of structural parameters, so that a frequency selection surface design method for target frequency is obtained; a method of designing a frequency selective surface based on continuous fiber 3D printing, comprising:
1) When the frequency selection surface needs to reflect high-frequency electromagnetic waves, the arc length of a C-shaped arc of the chiral metamaterial array structure needs to be reduced, so that the wave crest of the electromagnetic reflectivity moves to high frequency; when the frequency selection surface needs to reflect low-frequency electromagnetic waves, the arc length of a C-shaped arc of the chiral metamaterial array structure needs to be increased, so that the wave crest of the electromagnetic reflectivity moves to the low frequency;
referring to fig. 2, the method of increasing the arc length of the "C" shaped arc is to increase the radius r of the "C" shaped arc, or to increase the radian a of the "C" shaped arc; the method for reducing the arc length of the C-shaped circular arc is opposite;
2) When the frequency selective surface needs to reflect broadband electromagnetic waves, the surface density of the chiral metamaterial array structure needs to be increased, namely the proportion of the area occupied by the metamaterial in a unit square area is increased, so that the bandwidth of an electromagnetic reflectivity-frequency curve at the specified reflectivity is widened; when the frequency selection surface needs to reflect narrow-frequency electromagnetic waves, the surface density of the chiral metamaterial array structure needs to be reduced, so that the bandwidth of an electromagnetic reflectivity-frequency curve at the specified reflectivity is narrowed;
referring to fig. 2, the method for increasing the surface density of the chiral metamaterial array structure is to increase the radian a of the C-shaped arc and simultaneously reduce the radius r of the C-shaped arc, and change a four-chiral unit structure 1 into a six-chiral unit structure 2; the method for reducing the surface density of the chiral metamaterial array structure is opposite.
Referring to fig. 2, the width t of the "C" arc is determined by the printing material and the nozzle caliber of the 3D printer, and is generally 0.2-1.5 mm;
referring to fig. 2, the radian a of the C-shaped arc is limited to the maximum angle by the geometric relationship, and the frequency selection characteristic of the structure with a smaller angle is not obvious, generally 0.6 pi to 1.2 pi;
referring to fig. 2, the radius r of the "C" arc has a proportional relation with the width t, reflecting the contour density of the structure, and the ratio of r/t is generally not more than 10, otherwise the resonance peak value will be reduced, and the frequency selection function cannot be well satisfied.
The existing 3D printing and slicing software cannot guarantee the continuity of the fiber to the maximum extent on the printing track generated by the structure, the performance of the frequency selection surface is directly influenced, and therefore a scheme of the moving track of the printing nozzle suitable for rapidly manufacturing the structure is designed; a method of manufacturing a frequency selective surface based on continuous fiber 3D printing, comprising the steps of:
1) Referring to fig. 4, for the quadric-chiral metamaterial array 4, starting to print from the structure edge, first, continuous circular arc lines in a first direction are printed in a reciprocating manner; after all the continuous arc lines distributed in the first direction are finished, sequentially printing the continuous arc lines in the second direction in a reciprocating mode from the adjacent edges;
for the hexa-chiral metamaterial array 5, after all the continuous arc lines distributed in the second direction are finished, the continuous arc lines in the third direction are sequentially printed in a reciprocating mode from the adjacent edges;
the first direction is two directions of a connecting line of the starting points and the ending points of the continuous circular arc line selected for the first time, the second direction is two directions of a connecting line of the starting points and the ending points of the continuous circular arc line selected for the second time, and the third direction is two directions of a connecting line of the starting points and the ending points of the continuous circular arc line selected for the third time; the four-chiral metamaterial array 4 only has a first direction and a second direction, the included angle between the first direction and the second direction is 90 degrees, the six-chiral metamaterial array 5 has the first direction, the second direction and a third direction, and the included angles of the first direction, the second direction and the third direction are 60 degrees;
2) And finishing the printing of the first layer, and repeating the steps when the second layer and the later layers are at the positions corresponding to the layer heights.
In the manufacturing process of the manufacturing method, auxiliary cooling measures such as air blowing and the like are applied to quickly cool and shape the molten and extruded material so as to avoid the structural deformation caused by the tensile force of the fiber.
The speed of printing the first layer is generally 100 to 400mm/min and the speed of printing the other layers is generally 0.5 to 0.8 times that of printing the first layer.
The 3D printer used in the manufacturing method is generally a continuous fiber composite material 3D printer having a function of cutting fiber yarns, and if a printer having no cutting function is used, it is necessary to post-treat the printed parts and remove the parts printed by the nozzle skip.
The material used in the manufacturing method is a composite material of continuous fibers and resin, the continuous fibers comprise metal wires, carbon fiber wires and other materials with good electric conductivity, and the resin comprises PLA, ABS, PA, PC, PPS, PEI, PEEK and the like.
Referring to fig. 5, fig. 5 is a schematic diagram of an S11 parameter curve reflecting the influence of the change of the arc radius of the four-chiral frequency selective surface on the reflection performance, and the frequency corresponding to the peak value of S11 can be adjusted at 7.4 to 16.2GHz by changing the arc radius of 3 to 7 mm.
Referring to fig. 6, fig. 6 is a schematic diagram of an S11 parameter curve reflecting the influence of changing the arc radian of the quadric-chiral frequency selective surface on the reflection performance, and by changing the arc radian from 0.83 pi to 1.17 pi, the frequency corresponding to the peak value of S11 can be adjusted from 10 GHz to 12.4 GHz.
Referring to fig. 7, fig. 7 is a schematic diagram of an S11 parameter curve reflecting the influence of the surface density change of the quadrichiral frequency selective surface on the reflection performance, and by changing the arc radius of 4.5-5.625 mm and the arc radian of 0.89 pi-1.11 pi, the arc length is unchanged but the surface density is changed, so that the half-power bandwidth of S11 can be further adjusted within 2-4.3 GHz, but the frequency corresponding to the peak value is maintained within 10.3 ± 0.3GHz.
Referring to fig. 8, fig. 8 is a schematic diagram of an S11 parameter curve reflecting the influence of the type of the frequency selective surface changing structure on the reflection performance, and by changing the type of the unit structure, the surface density is changed, so that the half-power bandwidth of S11 can be further changed between 3GHz and 6.3 GHz.
Referring to fig. 9, fig. 9 is a schematic diagram of an S11 parameter curve reflecting the influence of different structures of a same surface density and four-chiral frequency selective surface on reflection performance, and by changing the arc radius of 4.47-6.25 mm and the arc radian of 0.83 pi-1.17 pi, the surface density is unchanged but the arc length of the arc is changed, so that the half-power bandwidth of S11 can be further maintained at 3.4 ± 0.2GHz, but the frequency corresponding to the peak value is adjustable at 7.8-14.3 GHz.
Claims (10)
1. A frequency selective surface based on continuous fiber 3D printing, characterized by: the unit structures are respectively a four-chiral unit structure (1) and a six-chiral unit structure (2); the four-chiral unit structure (1) is formed by rotationally and symmetrically distributing four C-shaped arc rods (3) with equal sizes, and a four-chiral metamaterial array (4) is formed in an array form by end-to-end connection; the hexachiral unit structure (2) is formed by rotationally and symmetrically distributing six C-shaped arc rods (3) with equal sizes, and a hexachiral metamaterial array (5) is formed in an array form of end-to-end connection; the four-chiral metamaterial array (4) or the six-chiral metamaterial array (5) is used for constructing the frequency selective surface.
2. The method for designing a frequency selective surface based on continuous fiber 3D printing as claimed in claim 1, comprising:
1) When the frequency selection surface needs to reflect high-frequency electromagnetic waves, the arc length of a C-shaped arc of the chiral metamaterial array structure needs to be reduced, so that the wave crest of the electromagnetic reflectivity moves to high frequency; when the frequency selection surface needs to reflect low-frequency electromagnetic waves, the arc length of a C-shaped arc of the chiral metamaterial array structure needs to be increased, so that the wave crest of the electromagnetic reflectivity moves to the low frequency;
the method for increasing the arc length of the C-shaped arc is to increase the radius r of the C-shaped arc or increase the radian a of the C-shaped arc; the method for reducing the arc length of the C-shaped arc is opposite;
2) When the frequency selective surface needs to reflect broadband electromagnetic waves, the surface density of the chiral metamaterial array structure needs to be increased, namely the proportion of the area occupied by the metamaterial in a unit square area is increased, so that the bandwidth of an electromagnetic reflectivity-frequency curve at the specified reflectivity is widened; when the frequency selection surface needs to reflect narrow-frequency electromagnetic waves, the surface density of the chiral metamaterial array structure needs to be reduced, so that the bandwidth of an electromagnetic reflectivity-frequency curve at the specified reflectivity is narrowed;
the method for increasing the surface density of the chiral metamaterial array structure is to increase the radian a of a C-shaped arc and simultaneously reduce the radius r of the C-shaped arc, and a four-chiral unit structure (1) is changed into a six-chiral unit structure (2); the method for reducing the surface density of the chiral metamaterial array structure is opposite.
3. The design method according to claim 2, wherein: the width t of the C-shaped arc is determined by the printing material and the caliber of a nozzle of the 3D printer and is 0.2-1.5 mm.
4. The design method according to claim 2, wherein: the radian a of the C-shaped arc is limited to the maximum angle by the geometrical relationship and is 0.6 pi-1.2 pi.
5. The design method according to claim 2, wherein: the radius r and the width t of the C-shaped circular arc have a proportional relation and reflect the contour density of the structure, and the ratio of r/t is not more than 10.
6. A method of manufacturing a frequency selective surface based on continuous fiber 3D printing according to claim 1, comprising the steps of:
1) For the four-chiral metamaterial array (4), starting to print from the edge of the structure, and sequentially printing continuous circular arc lines in a first direction in a reciprocating manner; after all the continuous arc lines distributed in the first direction are finished, sequentially printing the continuous arc lines in the second direction in a reciprocating mode from the adjacent edges;
for the hexa-chiral metamaterial array (5), after all the continuous arc lines distributed in the second direction are finished, the continuous arc lines in the third direction are sequentially printed in a reciprocating mode from the adjacent edges;
the first direction is two directions of a connecting line of starting points and ending points of the continuous circular arc line selected for the first time, the second direction is two directions of a connecting line of starting points and ending points of the continuous circular arc line selected for the second time, and the third direction is two directions of a connecting line of starting points and ending points of the continuous circular arc line selected for the third time; the four-chiral metamaterial array (4) only has a first direction and a second direction, the included angle between the first direction and the second direction is 90 degrees, the six-chiral metamaterial array (5) has a first direction, a second direction and a third direction, and the included angles of the first direction, the second direction and the third direction are 60 degrees;
2) And finishing the printing of the first layer in the steps, and repeating the steps when the second layer and the later layers are at the positions corresponding to the layer heights.
7. The manufacturing method according to claim 6, characterized in that: auxiliary cooling measures are applied in the manufacturing process, so that the molten and extruded material is rapidly cooled and shaped, and the structure deformation caused by the tensile force of the fiber is avoided.
8. The manufacturing method according to claim 6, characterized in that: the speed of printing the first layer is 100-400 mm/min, and the speed of printing other layers is 0.5-0.8 times of that of printing the first layer.
9. The manufacturing method according to claim 6, characterized in that: the used 3D printer is a continuous fiber composite material 3D printer with a function of cutting off the fiber yarns, and if the printer without the function of cutting off is used, the printed parts need to be subjected to post-processing, and the parts printed due to the jumping of the spray head are removed.
10. The manufacturing method according to claim 6, characterized in that: the used material is a composite material of continuous fibers and resin, the continuous fibers comprise metal wires and carbon fiber wires, the conductive performance of the material is good, and the resin comprises PLA, ABS, PA, PC, PPS, PEI and PEEK.
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| CN115911879A (en) * | 2023-01-09 | 2023-04-04 | 中国科学院长春光学精密机械与物理研究所 | Three-dimensional annular frequency selection antenna housing/antenna window and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115911879A (en) * | 2023-01-09 | 2023-04-04 | 中国科学院长春光学精密机械与物理研究所 | Three-dimensional annular frequency selection antenna housing/antenna window and preparation method thereof |
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